what happens to the relative speed between rotor and stator when the magnetic flux increases?
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Answer. The speed of rotor gradually increases and tries to catch up with the speed of rotating magnetic field, but it fails to reach synchronous speed, because if it catches up with speed of magnetic field, relative speed becomes zero and hence no EMF will be induced in the rotor conductors, the torque becomes zero.
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The speed of the rotor rotating field with respect to the stator is Ns and with respect to the stator rotating magnetic field is zero.This difference in speed depends upon load on the motor.i-The relative speed (Ns-N)is sometimes called slip speed. II-Rotor (or Motor) speed is N=(1s)Ns.iii-When the rotor is stationary (i.e.,N=0),s=1=100%.
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